Ext JS is well suited for creating enterprise-level applications with large amounts of data. If you have an application that is data intensive, needs to be fast, and requires a complete customized UI, you should use Ext JS.

Peter Tierney, IT Analyst, Williams

We use Ext JS, Sencha Touch and Sencha Cmd to build rich, native-like apps with a superior user experience that solve business problems in an uncompromising way.

Rouslan Zenetl, Director of Application Development, National Hockey League

One framework, multiple form factors and devices, including desktop and mobile -- that’s the promise of Ext JS 5. We build our app once, and our developers move quickly and easily onto new projects.

Chris Thornhill, Chief Architect, Aptean

Ext JS has enabled our teams to quickly prototype concepts using mock data — allowing business stakeholders and clients the opportunity to provide feedback that can be easily incorporated into the development cycle.